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;FF[3]GM[1]AP[PocketGoban Ver 0.999]
SZ[19]HA[2]PB[Yasui Shunchi]PW[Honinbo Dosaku]
DT[1683-11-19]
PC[Japan]RE[B+1]SO[http://gobase.org/games/japan/misc/disks/dosaku/dosak24x.sgf]US[Converted by sgf2misc-2.7.2]KM[0]
AB[dp][pd]C[
 UC: "Dosaku's Masterpiece"
 UC: Commentary adapted from commentaries by Ohira Shuzo and Go Seigen.]
;W[cd];B[ec];W[nc];B[qg]C[
 Black 4. The ogeima used to be the standard response to the kogeima kakari
 UC: against hoshi.]
;W[ic];B[qp]C[
 UC: 6 is in the wrong direction.]
;W[oq];B[lq];W[dc];B[cm]C[
 UC: 10 is an old-style move.]
;W[qc];B[pc];W[qd];B[qe]C[
 UC: 14 is a suspect move.]
;W[re];B[qf];W[pb];B[ob];W[qb];B[oc]C[
 UC: This result is bad for Black. White can expose his weak points with A or B.]
;W[qm];B[po];W[qj]C[
 UC: 23 is effectively sente.]
;B[nd]C[
 UC: Black cannot allow White to follow up at 24.]
;W[ed];B[cj]C[
 UC: 26 is too small-scale and low.]
;W[lp]C[
 UC: 27 is an aggressive move.]
;B[kp];W[mq];B[lo]C[
 UC: 30 is slightly dubious.]
;W[mp];B[kq];W[on];B[pq];W[ko];B[jo]C[
 UC: Black has to sacrifice the t stone.]
;W[kn];B[jn];W[ip]C[
 UC: 39 is an excellent countermeasure to Black's sequence, and is the main
 UC: reason why t would have been better left unplayed.]
;B[km];W[ln];B[jp];W[fq]C[
 UC: 43 is an attempt to settle White quickly.]
;B[eq];W[fp];B[hq];W[iq];B[hp];W[do];B[co];W[dn];B[cn];W[er]
;B[dr];W[gr];B[hr];W[cq];B[es]C[
 UC: 58 is a good answer to White's invasion.
]
;W[dq]C[
 UC: 59, starting a ko, is inevitable.]
;B[fr];W[ep];B[cp];W[er];B[lm]C[
 UC: 64 is a valid ko threat but is also aji-keshi.]
;W[mn];B[eq];W[pr]C[
 UC: Black has no more valid threats, so he has to ignore 67.]
;B[er];W[qr]C[
 UC: He has to connect the ko, but White gains from the exchange.]
;B[rf]C[
 UC: 70 has been almost universally condemned as a poor move. (Some people think
 UC: Black may have been aiming at A on the right side, but 70 seems to have no
 UC: effect on this possibility.)]
;W[nb];B[mc];W[mb];B[lc];W[lb];B[oa]C[
 UC: After 76, White is happy to abandon the corner in sente.]
;W[kc];B[rd];W[ho];B[go];W[gn];B[hn];W[io];B[ir]C[
 UC: Black 84 is submissive but necessary.]
;W[fo];B[gp]C[
 UC: Black 86 is forced.]
;W[dj];B[ci]C[
 UC: 88 is a solid move.]
;W[dl];B[cl];W[hm];B[in];W[cg];B[gm];W[fn];B[gl];W[gk]C[
 UC: 97 is a nice tesuji for saving the white group.]
;B[hk]C[
 UC: Black has to give way at 98.]
;W[gj];B[fl];W[el];B[ej];W[ei]C[
 UC: 03 is another tesuji.]
;B[di];W[fk];B[hl];W[eh]C[
 UC: White saves his group and builds up his top moyo.]
;B[dg]C[
 UC: 08 is a strong move.]
;W[dh];B[ch];W[eg]C[
 UC: 11 is necessary.]
;B[bg];W[df]C[
 UC: Black is left with a large yose at A.]
;B[hj]C[
 UC: 14 is a thick move aiming at the forcing hane of A.]
;W[md]C[
 UC: 15 is probably the best White can do.]
;B[if];W[ne];B[oe];W[of]C[
 UC: White's double hane is a good answer to the t erasing move.]
;B[ql];W[pl]C[
 UC: White has no defence against 20.]
;B[qk];W[pk];B[rm];W[qn];B[rj];W[ri]C[
 UC: 27 is a tesuji.]
;B[qi];W[pj];B[rk]C[
 UC: There is some aji left in the t stone.]
;W[rn]C[
 UC: Black destroys White's side territory in sente.]
;B[bf]C[
 UC: This is the biggest move left, (about 15 points) and is sufficient to win
 UC: the game.]
;W[od]C[
 UC: Capturing at 33 is White's privilege.]
;B[gi];W[ek];B[nd];W[hh];B[ih];W[od];B[pe];W[hg];B[ig];W[hf]
;B[hi];W[qh];B[rh];W[pi];B[si];W[sm]C[
 UC: 49 is reverse sente.]
;B[sl];W[rl];B[dm];W[em];B[rm];W[sn];B[ad]C[
 UC: Black could have played 56 almost any time he liked.]
;W[bc];B[he];W[ie];B[je];W[id];B[gf];W[ge];B[gg];W[hd];B[dk]
;W[fi];B[gh]C[
 UC: The result to 68 is gote but it ruins White's territory and leaves behind
 UC: the possibility of capturing three stones.]
;W[sj];B[qi];W[rc];B[se];W[ri];B[sh]C[
 UC: Black 74 is forced.]
;W[qi];B[mj];W[rl];B[en];W[fm]C[
 UC: It's better for White to connect here and sacrifice two stones than to
 UC: capture.]
;B[rm];W[ml];B[mm];W[nm];B[ll];W[rl];B[mg]C[
 UC: 86 is another good move. At this stage both players probably knew Black
 UC: would win by 1 point.]
;W[mk];B[lk];W[nj];B[nk];W[nl];B[ni];W[mi]C[
 UC: 93 is a tesuji.]
;B[lj]C[
 UC: Black has to connect at 94.]
;W[nh];B[oj];W[mh];B[lh];W[lg];B[li];W[kf];B[jf];W[kh];B[kg]C[
 UC: 04 is a tesuji.]
;W[lf];B[rm];W[sd];B[sc];W[rl];B[eo];W[gq];B[gs];W[fj]C[
 UC: 11 and 13 are only worth 3 points in reverse sente, but this is now big, and
 UC: it also leaves A and B as ko threats.]
;B[sb]C[
 UC: 14 eliminates the dangerous ko that could develop if White played there.]
;W[jg];B[ki];W[lr]C[
 UC: White 17 stops Black playing there in sente.]
;B[kr];W[be];B[ae];W[ac];B[rm];W[cr]C[
 UC: White is threatening to live here with White A, Black B, White C.]
;B[br];W[rl];B[ff];W[cf]C[
 UC: White's answer at 27 is essential.]
;B[fe];W[fd];B[rm];W[hs];B[is];W[rl];B[nd];W[me];B[rm];W[bh]
;B[bi];W[rl];B[he];W[hf];B[mr];W[nr];B[ls];W[sk];B[ke];W[le]
;B[og];W[ng];B[pf];W[ok];B[nf];W[oh];B[nj];W[dj];B[ah]C[
 UC: Black has no option but to play 56 here.]
;W[ck];B[bk];W[af];B[ag];W[dk];B[hg];W[he];B[ee];W[de];B[jh]
;W[kg];B[na];W[ma];B[jd];W[jc];B[kd];W[ld];B[ns];W[os];B[ms]
;W[od]
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